patch 8.0.1214: accessing freed memory when EXITFREE is set

Problem:    Accessing freed memory when EXITFREE is set and there is more than
            one tab and window. (Dominique Pelle)
Solution:   Free options later.  Skip redraw when exiting.
diff --git a/src/screen.c b/src/screen.c
index 3e08b60..c92b17e 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -203,7 +203,7 @@
     win_T	*wp,
     int		type)
 {
-    if (wp->w_redr_type < type)
+    if (!exiting && wp->w_redr_type < type)
     {
 	wp->w_redr_type = type;
 	if (type >= NOT_VALID)